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AM4372: 1GB RAM 16bit or 32bits

Part Number: AM4372

HI TI!

I am doing a design based on AM4372 and I need 1GB of RAM.

I have these two options:


Option 1-) 2 x 512MB 16bit ram chip (A0-A14,D0-D31) 

Option 2-) 1 x 1GB 16bit ram chip (A0-A15,D0-D15)

Which option has the highest system speed?

Where can I find information on the subject?

I am right? 

What are the speed implications if I use option 2 or 3?

Sincerely thnkoy very much!